[dylan604]

Pigment does have weight. I'm not sure of anything useful that has no mass.

[thfuran]

Photons are useful.

[dylan604]

Not if you are blind

[thfuran]

I'm both not blind and sure that fiber optics (and solar panels and trees) don't much care.

[ceejayoz]

Blind people would find themselves cold and hungry without the sun’s photons.