If you like; I prefer my flaming spheres with a coppery green colour with little clowns playing leapfrog amongst the flames.

What the rules do say is, its a sphere of fire:

a round solid figure, or its surface, with every point on its surface equidistant from its centre.

A sphere can be either a solid ball i.e. fire all the way through, 5 feet of which is going to be pretty damn opaque no matter how translucent the flames are or its the surface. Both are valid English meanings.

As the rules don't say then it is up to your group to imagine how these things are:

1. Its opaque and blocks line of sight
2. Its translucent and doesn't
3. The caster can decide each time they cast the spell

Hint: No 2 is by far the simplest to play with.

If you like; I prefer my flaming spheres with a coppery green colour with little clowns playing leapfrog amongst the flames.

What the rules do say is, its a sphere of fire:

a round solid figure, or its surface, with every point on its surface equidistant from its centre.

A sphere can be either a solid ball i.e. fire all the way through, 5 feet of which is going to be pretty damn opaque no matter how translucent the flames are or its the surface. Both are valid English meanings. It is not, however, anything "covered with fire"; it's just fire.

As the rules don't say then it is up to your group to imagine how these things are:

1. Its opaque and blocks line of sight
2. Its translucent and doesn't
3. The caster can decide each time they cast the spell

Hint: No 2 is by far the simplest to play with.

If you like; I prefer my flaming spheres with a coppery green colour with little clowns playing leapfrog amongst the flames.

What the rules do say is, its a sphere of fire:

a round solid figure, or its surface, with every point on its surface equidistant from its centre.

A sphere can be either a solid ball i.e. fire all the way through, 5 feet of which is going to be pretty damn opaque no matter how translucent the flames are or its the surface. Both are valid English meanings.

As the rules don't say then it is up to your group to imagine how these things are:

1. Its opaque and blocks line of sight
2. Its translucent and doesn't
3. The caster can decide each time they cast the spell

If you like; I prefer my flaming spheres with a coppery green colour with little clowns playing leapfrog amongst the flames.

What the rules do say is, its a sphere of fire:

a round solid figure, or its surface, with every point on its surface equidistant from its centre.

A sphere can be either a solid ball i.e. fire all the way through, 5 feet of which is going to be pretty damn opaque no matter how translucent the flames are or its the surface. Both are valid English meanings.

As the rules don't say then it is up to your group to imagine how these things are:

1. Its opaque and blocks line of sight
2. Its translucent and doesn't
3. The caster can decide each time they cast the spell

Hint: No 2 is by far the simplest to play with.