Step 1:
This paper is 15 x 60 centimeters in size, four white square papers glued together with red shiny wrapping paper taped to one side.
Prefold over these two lines.

Step 6:
Prefold over the diagonal line first and use it as guidance for placing the valley-fold.
The mountain-fold on the right goes to the place between the arrows.

Step 5:
Valley-fold over these two lines, the right part of the lines is under the upper paper layer. The corners indicated by the arrows are pulled to the inside.

Step 2:
Prefold over these three lines.

Step 4:
Mountain-fold over these two lines. The corners indicated by the arrows are pulled to the inside.

Step 3:
Prefold over these two lines. The mountain-fold goes to the place between the arrows.

Step 10:
Make the model flat by folding over this line.

Step 8:
Valley-fold over these two lines.

Step 9:
Turn the model again.

Step 7:
Turn the model.

Step 16:
Press the parts indicated by the two dots against each other, then valley-fold over the orange line. The flap goes under the layer indicated by the arrow.

Step 15:
Make an inside reverse fold over these (prefolded) lines.

Step 12:
Make a triangular stem by glueing or taping the edges together, see arrows.
Turn the model again.

Step 11:
Prefold over these two lines, then turn the model again.

Step 14:
This is how the model looks now.

Step 13:
Valley-fold over these two lines, use tape or glue to connect the edges (if necessary)

Step 17:
Make sharper folding lines, try to make the edges of the glass as straight as possible (see pink lines on the outside).