the cloud block texture is transparent

i have been doing a bit of an midnight research in the sharedassets folders to atleast try to find some trace of old texture in the games files or try to understand how textures are applied in blocks, but before closing paint.net, i realized the cloud texture is transparent, and i did that by making a layer below the textures image and put some a red square block and it was a bit visible, as it shows:




could this possibly mean that cloud can be utilized to be like glass?